index.js

const fs = require('fs');
const { exec } = require('child_process');
const path = require('path');
const dotenv = require('dotenv');
dotenv.config();

function validateInputs() {
    const args = process.argv.slice(2);
    const params = {};

    for (const arg of args) {
        if (arg.startsWith('--url')) {
            params.url = arg.replace('--url=', '');
        }

        if (arg.startsWith('--language')) {
            params.language = arg.replace('--language=', '');
        }
    }

    if (!params.url) throw new Error('Missing required parameter: --url');
    if (!params.language) throw new Error('Missing required parameter: --language');

    return params;
}

/**
 * Extract video information and download the video using yt-dlp.
 *
 * @param {string} videoUrl - The URL of the video to download.
 * @param {string} downloadPath - The directory where the video will be saved.
 * @returns {Promise<Object>} - A promise that resolves with video information (title, duration, filepath).
 */
function extractVideoInfo(videoUrl, downloadPath = './downloads') {
    console.log('📥 Downloading Video Info...');
    return new Promise((resolve, reject) => {
        if (!fs.existsSync(downloadPath)) {
            fs.mkdirSync(downloadPath, { recursive: true });
        }

        // yt-dlp command to download video and save metadata
        const command = `
            yt-dlp -f "bestvideo[ext=mp4]+bestaudio[ext=m4a]/mp4" \
            --merge-output-format mp4 \
            --write-info-json \
            -o "${path.join(downloadPath, '%(title)s.%(ext)s')}" \
            "${videoUrl}"
        `;

        exec(command, (error, stdout, stderr) => {
            if (error) {
                console.error('Error executing yt-dlp:', stderr || error.message);
                return reject(`Error downloading video: ${stderr || error.message}`);
            }

            // Find the .info.json file generated by yt-dlp
            const jsonFile = fs.readdirSync(downloadPath).find(file => file.endsWith('.info.json'));
            if (!jsonFile) {
                return reject('Video information file not found.');
            }

            // Read and parse the JSON file
            const jsonFilePath = path.join(downloadPath, jsonFile);
            fs.readFile(jsonFilePath, 'utf8', (err, data) => {
                if (err) return reject(`Error reading info JSON: ${err.message}`);

                const videoInfo = JSON.parse(data);
                const result = {
                    title: videoInfo.title,
                    duration: videoInfo.duration,
                    filepath: path.join(downloadPath, `${videoInfo.title}.mp4`)
                };

                // Optionally delete the JSON file after reading
                fs.unlinkSync(jsonFilePath);
                resolve(result);
            });
        });
    });
}

async function transcriptWithTimeStamp(videoPath) {
    console.log(`Transcribing video: ${videoPath}`);
    // Implement transcription logic using OpenAI Whisper
}

async function translate(transcription, targetLanguage) {
    console.log(`Translating transcription to ${targetLanguage}`);
    // Implement translation logic using OpenAI GPT
}

async function textToSpeech(translatedText) {
    console.log(`Generating audio from translated text`);
    // Implement TTS logic using OpenAI TTS
}

async function synchronizeAudio(videoPath, audioPath) {
    console.log(`Synchronizing audio with video: ${videoPath}`);
    // Implement synchronization logic
}

async function exportFinalVideo(videoPath, finalAudioPath) {
    console.log(`Exporting final video: ${videoPath}`);
    // Implement video export logic using FFmpeg
}

async function main() {
    try {
        const { url, language } = validateInputs();

        console.log('✨ Starting Witchcraft process...');

        const videoPath = await extractVideoInfo(url);
        const transcription = await transcriptWithTimeStamp(videoPath);
        const translatedText = await translate(transcription, language);
        const audioPath = await textToSpeech(translatedText);
        const finalAudioPath = await synchronizeAudio(videoPath, audioPath);

        await exportFinalVideo(videoPath, finalAudioPath);

        console.log('Video processing complete! 🎉');
    } catch (error) {
        console.error(`Error: ${error.message}`);
        process.exit(1);
    }
}

main();